MCPE-47146 reports jumbled treasure maps, not glitchy/slow map loading, This is a different issue.
Similliar bug also happened to me. We have realms, and there was an unloaded chunk. Whatever you did there, the blocks were invisible (but there) redstone completely didn't work, and if you logged out, you would be loading forever. I don't know why or when, but at some point the chunk fixed itself and i could get in. That was 1.12 bedrock.
Put the videos on your micro sd card and then put it in your computer, the files should be there.
hmm, fortune works on coal for me. It doesn't ALWAYS drop more coal, maybe you just got unlucky?
this must be somehow because when you place a block the redstone ore turns into a glowing one. I had the same issue. Mojang, pls fix.
I advise you to try to replicate this bug or the report is useless.