Spreadsheet Corrupts Upon Saving

Starting this week, a specific spreadsheet I've been using for years is now corrupting when I save it. First it'll prompt "We found a problem with some content. Do you want us to try to recover as much as we can?", and after clicking on Yes it'll come up with "Excel was able to open the file by repairing or removing the unreadable content. Removed Part: /xl/drawings/drawing1.xml part. (Drawing shape)".

I restored the spreadsheet from backup (saved and working fine 5 days ago) and I'm able to open... until I save it. Once it's saved, it'll corrupt it with the prompts mentioned above. For a test, I even opened a 2024 and a 2020 template version of this spreadsheet and I get the same issue now. I suspect an update was pushed and now somehow is corrupting some of this spreadsheet's objects.

Other spreadsheets seem to be ok, only this one is impacted; though I haven't opened all my spreadsheets to test yet.

Thoughts?