When I tried to activated a powered rail with a button or lever I can't do it if any portion of a sequence of adjacent powered rails is horizontal. If they are both tilted, it works fine. If one is horizontal, it lights up, but doesn't move a minecart. I haven't seen this issue before and all my zombie-ifier designs and minecart end-of-the-lines are based on one tilted rail and one horizontal, so I'm quite sure this was not a bug in previous version. I did this in 1.17 on Xbox bedrock so that worked. I recently started a realm and found that I couldn't move a minecart, so I'm assuming this is a realms issue.

If all adjacent powered rails are horizontal and powered permantently they appear to work.