Redstone contraption acting up, redstone block mysteriously vanishes on a vanilla server then reappears after attempting to replace it when I go to mine the piston. There was another instance of the redstone block vanishing a while back but that time it had deleted itself. I actually have a recording of it happening this time around when the automation system broke, whether or not it is reproducible to you, there is clearly a problem happening with the game and I doubt it has anything to do with the hardware of my machine either.
Why is this happening? it shouldn't, and it is evident bedrock edition is more glitchy when it comes to redstone than Java edition. Why this is the case I don't know, but this shouldn't be just because a game has been coded in C++, which many PC games use.
I do understand backup files are important because of situations like bitrot over time, even then surely it's possible to have error correction in this game? the game doesn't seem to do a very good job of keeping track of what was supposed to be there, when it affects things like player placed blocks that is an inconvenience we'd rather do without. So I hope a fix would happen which would drastically reduce the odds of this happening.
A friend also told me he does not trust Ender Chests because of an issue which can result in its contents being randomly deleted, whether or not this is an issue exclusive to bedrock edition I haven't yet seen it happen, nor can I prove it, but I do have evidence of other problems with the game.
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I guess crashes could in some cases cause this to happen, it is common for software crashes to result in file corruption I am aware, especially when it involves software that is actively writing to a file.
I do recall some cases of the game crashing, red-screening and then forced closing, but it doesn't happen very often. I couldn't install ECC memory because the system being used is incompatible with that type of RAM, so it may just be that the system being used is prone to interference, that I don't have a solution for, sorry. I hope that there is a fix, but if this is impossible then I'll just have to get on with it and improvise.
The bugged piston shown in your video is extending across a chunk border. Very rarely, possibly only due to crashes or force-closing, the piston arm, the piston arm and the moving block get saved in incompatible states because each chunk saves at a different time. We are tracking this issue at MCPE-92021, so I am resolving your report as a duplicate.