Yur4
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To show that the 5th step stated by KR_ is unnecessary to having the bug happen:
https://youtu.be/Y9I_zuqrn1A
While I hadn't tested Ominous events, this is the same bug. I just used a structure block with the data of a natural one as I was intending on figuring out work arounds for a map I was working on. Though this is the same bug as when I initially posted mine with the idea that it was trial spawners that I had gotten from /give had the issue and wasn't certain on all the details of this. I went and did further testing and found it just affected naturally spawning ones like I theorized it may when I made the bug report. Though there is an extra step that's unneeded to recreate the bug.
It actually doesn't matter whether or not you enter creative before the cooldown or not, the result is the same for one's placed by the player. I even show this by sitting in survival in a video posted within my pinned comment. Though if it is corrupted, its probably a problem with the reset process itself. However, my video shows results that it 100% is going to its initial placed state as placing the trial spawners without the structure block does leave it blank, while using structure block for the data of a natural one resets it to the original mob.
Ok so here is a link to the issue since I tried cutting the time down, but the upload limit was too small. This is a link showing that I put a spawn egg into the trial spawner and it reverts to its initial state of how it was when it was put into the world https://youtu.be/3VTtADIvQz8
Ok I have an update to the exact issue, if you use spawn eggs specifically it will revert the mob upon completion to either what is was before or nothing depending on if you placed it through a structure block or yourself. This probably applies to natural trial spawners. I'm gathering video to show the issue.
I can confirm that I'm killing all the mobs, you literally can't get loot if you don't finish it
I agree, if you want to set up something for an adventure map, just use structure blocks and put them in that way. Since the data for the trial spawners from there works fine outside of changing it with spawn eggs currently.