did you resolve this issue?

No not yet

I just finished submitting a support case for this as well. I spent my morning replicating with a new generic custom theme with no propriety customizations. Basically a "MyCoolTheme" demo and was able to reproduce this

it happens when i did change existing extension

I just finished a long call with NS support and this is part of an existing defect that Sani has a thread on. https://netsuiteprofessionals.slack.com/archives/C29HR0BFG/p1706550497657149

I am having the same problem...