Hmmm when I stated up #thunderbird today, for one of my accounts (1st in order), it receieved some of the folders again and put them directly as folders under inbox instead as separate folders not as part of inbox. When I check webmail looks normal. Do not know if 25 Oct Thunderbird release 115.4.1 was installed today or earlier. I wonder how my Thunderbird looks tomorrow. I wait with any further investigation until then. Normally, Thunderbird is a great companion - and free open source.