So I have good news and bad news.
The good news: shadowbanning isn't a thing on Tumblr. So you didn't do anything wrong.
The bad news: shadowbanning-like effects can sometimes happen just as a result of this website being built poorly. The search engine is especially bad here, so I'm not so surprised that anon found issues using that.
Hopefully it fixes itself. I suppose contacting support couldn't hurt, but given that these sorts of issues weren't done on purpose...
But at least you can rest easy knowing that shadowbanning isn't a thing on Tumblr
oh what interesting details... thank you. it really made me at ease ":3
i wrote them just in case. even if the problem does not solve itself (or they dont do anything) i will still continue to post here, just with a pinch of bitterness every time i upload something
during this time i learned that some of my friends and acquaintances had exactly the same situation, and even recreating the blog did not change anything (for convenience sake i will still call it a shadow ban because well. the only difference between it and this bug is that it was done accidentally and not intentionally, which makes the situation comical. congratulations in winning this ban lottery)
the person just lost access to one of the important parts of the blog with the help of which you could gain audience... im relatively lucky as i already have followers and reblogs they do help promote post-ban posts, but if you're just starting out and tags get turned off right away, thats literally the end right at the start (unless youre already famous somewhere else. which i wasnt so imagine my surprise if ive got this funny little problem after first post. i would think users just dont like my stuff and i would stop trying to use tumblr right away, even though its not my bad at all)
theyve been having this problem for years, its not an isolated case at all, support often ignores and doesn't solve the problem. and it happens unpredictably, and very unnoticeably, because again, if it wasn't for anon i probably would never have realized that this is even possible and i might have it
in conclusion this sucks. for the lack of better words in english i would say that it is absolutely ебануто