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Are you using a 64-bit 12.0.2 client? If so, that sounds very similar to a number of 64-bit related bugs having to do with LotusScript arrays. For example, https://support.hcl-software.com/csm?id=kb_article&sysparm_article=KB0102291 and https://support.hcl-software.com/csm?id=kb_article&sysparm_article=KB0109692
If you are using a 64-bit 12.0.2 client, you should consider opening a ticket with HCL about this. Unfortunately, with some of these bugs HCL decided to fix them by requiring you to update your 32-bit client instead of fixing the problem in the 64-bit client compiler. Which means it's possible that the only way it will work on a Notes 9 client is to always compile the LotusScript code on Notes 9 (or any 32-bit client).