Rectangle is fully open source, so rather than working with the community to fix the problem you're having (about 1/10th the effort you went into debugging the problem), you instead opt for a paid app? What you do if you were using Linux?
Maybe I should have bugged my dev friend who did the digging to submit a bug report, but I didn't think of that at the time.
Rectangle has a simple bug report template, and maintainers would probably guide you if you'd have trouble providing the requested information.
macOS version:
Rectangle version:
Logs if applicable (In Rectangle menu, hold option, "View Logging..."):
Paying $8 is also valid, but I wouldn’t complain about it. It’s just the cost you choose to pay to get what you want.