Exception thrown when clicking create "New credentials" Kind "Username with password"

I am running Jenkins on an ubuntu 22.04 server behind an nginx proxy server running on a different server. When creating “New credentials”, Kind:“Username with password” directly from the server on which Jenkins is running, everything works fine. When I try through the reverse proxy, uncaught java exceptions are thrown. Any insight or help would be great.

Thanks.

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Jenkins setup:
Jenkins: 2.426.2
OS: Linux - 5.15.0-91-generic
Java: 17.0.9 - Private Build (OpenJDK 64-Bit Server VM)

ant:497.v94e7d9fffa_b_9
antisamy-markup-formatter:162.v0e6ec0fcfcf6
apache-httpcomponents-client-4-api:4.5.14-208.v438351942757
bootstrap5-api:5.3.2-3
bouncycastle-api:2.30.1.77-225.v26ea_c9455fd9
branch-api:2.1144.v1425d1c3d5a_7
build-timeout:1.32
caffeine-api:3.1.8-133.v17b_1ff2e0599
checks-api:2.0.2
cloudbees-folder:6.858.v898218f3609d
commons-lang3-api:3.13.0-62.v7d18e55f51e2
commons-text-api:1.11.0-95.v22a_d30ee5d36
credentials:1311.vcf0a_900b_37c2
credentials-binding:642.v737c34dea_6c2
display-url-api:2.200.vb_9327d658781
durable-task:543.v262f6a_803410
echarts-api:5.4.3-2
email-ext:2.104
font-awesome-api:6.5.1-1
git:5.2.1
git-client:4.6.0
github:1.37.3.1
github-api:1.318-461.v7a_c09c9fa_d63
github-branch-source:1772.va_69eda_d018d4
gradle:2.9
gson-api:2.10.1-15.v0d99f670e0a_7
instance-identity:185.v303dc7c645f9
ionicons-api:56.v1b_1c8c49374e
jackson2-api:2.16.1-373.ve709c6871598
jakarta-activation-api:2.0.1-3
jakarta-mail-api:2.0.1-3
javax-activation-api:1.2.0-6
javax-mail-api:1.6.2-9
jaxb:2.3.9-1
jjwt-api:0.11.5-77.v646c772fddb_0
jquery3-api:3.7.1-1
json-path-api:2.8.0-21.v8b_7dc8b_1037b_
junit:1256.v002534a_5f33e
ldap:711.vb_d1a_491714dc
mailer:463.vedf8358e006b_
matrix-auth:3.2.1
matrix-project:822.v01b_8c85d16d2
mina-sshd-api-common:2.11.0-86.v836f585d47fa_
mina-sshd-api-core:2.11.0-86.v836f585d47fa_
okhttp-api:4.11.0-157.v6852a_a_fa_ec11
pam-auth:1.10
pipeline-build-step:540.vb_e8849e1a_b_d8
pipeline-github-lib:42.v0739460cda_c4
pipeline-graph-analysis:202.va_d268e64deb_3
pipeline-groovy-lib:700.v0e341fa_57d53
pipeline-input-step:477.v339683a_8d55e
pipeline-milestone-step:111.v449306f708b_7
pipeline-model-api:2.2168.vf921b_4e72c73
pipeline-model-definition:2.2168.vf921b_4e72c73
pipeline-model-extensions:2.2168.vf921b_4e72c73
pipeline-rest-api:2.34
pipeline-stage-step:305.ve96d0205c1c6
pipeline-stage-tags-metadata:2.2168.vf921b_4e72c73
pipeline-stage-view:2.34
plain-credentials:143.v1b_df8b_d3b_e48
plugin-util-api:3.8.0
resource-disposer:0.23
scm-api:683.vb_16722fb_b_80b_
script-security:1313.v7a_6067dc7087
snakeyaml-api:2.2-111.vc6598e30cc65
ssh-credentials:308.ve4497b_ccd8f4
ssh-slaves:2.948.vb_8050d697fec
structs:337.v1b_04ea_4df7c8
timestamper:1.26
token-macro:400.v35420b_922dcb_
trilead-api:2.133.vfb_8a_7b_9c5dd1
variant:60.v7290fc0eb_b_cd
workflow-aggregator:596.v8c21c963d92d
workflow-api:1283.v99c10937efcb_
workflow-basic-steps:1042.ve7b_140c4a_e0c
workflow-cps:3837.v305192405b_c0
workflow-durable-task-step:1313.vcb_970b_d2a_fb_3
workflow-job:1385.vb_58b_86ea_fff1
workflow-multibranch:773.vc4fe1378f1d5
workflow-scm-step:415.v434365564324
workflow-step-api:657.v03b_e8115821b_
workflow-support:865.v43e78cc44e0d
ws-cleanup:0.45

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Exceptions thrown:

Jan 20 00:42:57 jenkins-server jenkins[39652]: 2024-01-20 00:42:57.985+0000 [id=265] WARNING o.e.j.s.h.ContextHandler$Context#log: Error while serving https://somesubdomain.com/manage/credentials/store/system/domain/_/createCredentials
Jan 20 00:42:57 jenkins-server jenkins[39652]: java.lang.IllegalArgumentException: The frontend sent an unexpected list of classes ([“com.cloudbees.plugins.credentials.impl.UsernamePasswordCredentialsImpl”,“org.jenkinsci.plugins.github_branch_source.GitHubAppCredentials”,“com.cloudbees.jenkins.plugins.sshcredentials.impl.BasicSSHUserPrivateKey”,“org.jenkinsci.plugins.plaincredentials.impl.FileCredentialsImpl”,“org.jenkinsci.plugins.plaincredentials.impl.StringCredentialsImpl”,“com.cloudbees.plugins.credentials.impl.CertificateCredentialsImpl”]) rather than an expected single class. See Table to div layout migration for more information.
Jan 20 00:42:57 jenkins-server jenkins[39652]: at org.kohsuke.stapler.RequestImpl$TypePair.convertJSON(RequestImpl.java:750)
Jan 20 00:42:57 jenkins-server jenkins[39652]: Caused: java.lang.IllegalArgumentException: Failed to instantiate interface com.cloudbees.plugins.credentials.Credentials from {“stapler-class”:[“com.cloudbees.plugins.credentials.impl.UsernamePasswordCredentialsImpl”,“org.jenkinsci.plugins.github_branch_source.GitHubAppCredentials”,“com.cloudbees.jenkins.plugins.sshcredentials.impl.BasicSSHUserPrivateKey”,“org.jenkinsci.plugins.plaincredentials.impl.FileCredentialsImpl”,“org.jenkinsci.plugins.plaincredentials.impl.StringCredentialsImpl”,“com.cloudbees.plugins.credentials.impl.CertificateCredentialsImpl”],“$class”:[“com.cloudbees.plugins.credentials.impl.UsernamePasswordCredentialsImpl”,“org.jenkinsci.plugins.github_branch_source.GitHubAppCredentials”,“com.cloudbees.jenkins.plugins.sshcredentials.impl.BasicSSHUserPrivateKey”,“org.jenkinsci.plugins.plaincredentials.impl.FileCredentialsImpl”,“org.jenkinsci.plugins.plaincredentials.impl.StringCredentialsImpl”,“com.cloudbees.plugins.credentials.impl.CertificateCredentialsImpl”]}