Unfortunately, I do not have any great ideas. You might compare the working system and the non-working system for things like:
- Is the context where the pipeline syntax generator is opened the same in the passing and the failing case? For example, is it failing when opened from a different URL in one case than in the other?
- Have you run the full set of configuration form modernization checks on both instances? If not, it may be worth running that complete set of checks, just in case you’ve found a new instance of a configuration form modernization problem
- What other differences are there between the working and non-working systems?