The command /locate don't work correctly on trail ruins.
Use this seed:892323955428232
/tp 15 -70 20
Then run the command /locate structure trail_ruins
It will say it's 866 blocks away, but there's a trail ruin above you (It breaks bedrock due to MCPE-179503).
Relates to MCPE-172251 and MCPE-179503.
Can confirm.