Reopening this since it seems to be happening in my world as well.
It is a realm started in 1.17, but we have been sure to travel extremely far away from spawn to generate 1.20 chunks.
Other ruins with suspicious sand have generated in these new chunks, which tells me I am far enough away to find Trail ruins, but they do not seem to be spawning at all.
Checked a locally downloaded save of the realm as well with no difference. Used Chunkbase to find locations of trail ruins, along with cheats to locate trail ruins as well.
Since the 1.18.31 patch I can confirm that the issues I reported in this original post have been resolved. Thank you to the team who were able to resolve this quickly.
Reopening this since it seems to be happening in my world as well.
It is a realm started in 1.17, but we have been sure to travel extremely far away from spawn to generate 1.20 chunks.
Other ruins with suspicious sand have generated in these new chunks, which tells me I am far enough away to find Trail ruins, but they do not seem to be spawning at all.
Checked a locally downloaded save of the realm as well with no difference. Used Chunkbase to find locations of trail ruins, along with cheats to locate trail ruins as well.
Seed is 1383886229.