Not that I plan to, but what happens if you receive the stamp (Covid)
"Extension of stay is under consideration. Must contact office again in person on..."
and you are one day late in contacting immigration?
I searched the forum and was unable to readily locate any info.
TLDR : Answer Summary
If you receive an 'Extension of stay under consideration' stamp related to Covid in Thailand and are one day late in contacting immigration, it's likely that there won't be severe penalties. Generally, immigration officers may provide you the remainder of your stamp, but you might face questions from them. It's essential to return to the same immigration office where you received the stamp, as you cannot visit a different office for this matter. While your passport might seem to show an overstay, the 'under consideration' stamp indicates you are not technically overstaying. However, having a thorough explanation ready for any queries regarding the stamp and its expiry date is advisable.