Honda Civic Automatic Transmission Oil Plug keeps coming out

The automatic transmission fluid (ATF) plug in my Honda civic 2014 kept coming out even though I inserted it securely. It was a miracle I didn’t lose it while driving. I would be checking the oil and all of a sudden the plug would be out again.
The root cause was that there is a small rubber piece that allows the pressure in the ATF to be released but it was clogged with dirt. Therefore it kept pushing the ATF plug out.
I cleaned the rubber piece to allow the pressure out and put it back in the two o’clock position (rather than facing forward like it was) to avoid dirt clogging it again. I think it is called Transmission Rubber Breather Cap with part number 21396-P20-000.

Since then, the ATF plug never came out again.
Other people in the comment suggested to replace the plug with an original Honda in addition to cleaning the small rubber piece. I bought this one from Amazon for $12: https://a.co/d/bR16SYM
I measured the diameter of the new one and it was 20.7 mm. The old one that kept coming out was 20.24 mm.

These two links are for Honda original parts:
https://honda.oempartsonline.com/oem-...
https://honda.oempartsonline.com/oem-...

New video showing the differences between the ATF Plug diameters:
   • Automatic Transmission Plug keeps com...