I upgraded from version 2.32x to the latest version 2.361. The upgrade was successful, but the links of some icons are in 404 status. How can I fix them?
So 2.361 is a weekly (one decimal is weekly, two isn stable/lts). Weekly changed how icons work. I don’t know the full details. Make sure you update your plugins to have the new fixes applied.
Cool. Doesn’t change my suggestion of making sure your plugins are updated. I’m not certain it’s fixed but it’s always the first suggestion
Thank you for your answer, I will check if it is caused by a plug-in not being updated, but this problem will not affect the actual use 
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As Gavin recommended, make sure you are using up to date versions of your plugins, specifically matrix-auth has to be newer than 3.0 in order to display the correct icon on modern Jenkins versions.
I addressed the change more than 6 months ago.