Greetings,
As best I can tell, there are two separate issues going on here.
- [removed - unrelated].
- Problems linking Manual Transactions to Non-transfer Recurring Reminders (click here).
This idea relates to #2 which really seems like a BUG. However, I'm doing this as an idea post in hopes of working through the proper channels.
In this screenshot, the recurring reminder IS NOT a transfer...
On the recurring reminder (RED X), when I click the three dots and "Link to transaction"...

I get this...

On the manually entered transaction (BLUE CHECK MARK), when I click on three dots and "Link to existing recurring"...

I get this...

I'm essentially doing the exact same action, just from two different starting points; one works, one doesn't. Like I said at the outset, this really seems more like a BUG since - from the users perspective - until you memorize which starting point to always use, you just get confused by a function that intermittently doesn't work.