Do I lose days if I apply for an immigration extension before my current visa stamp expires in Thailand?

Hi all,

Been over two years since I left.

Originally entered on a TR visa (1/1/2020)

with a UK passport.

Stayed on covid extensions (until they stopped issuing them).

I remember on covid extensions you would loose days if you applied earlier than your expiry date on the extension stamp.

I cannot remember if that’s the case for ordinary extensions at immigration?

(60 days on arrival, TR visas etc).

Thanks in advance.