Found previously placed and used rails missing from 2 areas near my base on 2 year old survival world. The rails were oridgionaly placed over 1 year ago and have been in regular use since (main mine cart track from base to other areas). They disappeared at some point in the last week (some time after last world backup 10/04/20). Minecart which was previously on the rails was still present. Neighbouring dispenser also still contained items. Coordinates between which bug occurred, approx: 2407, 61, 144 to 2407, 62, 154 and 2403, 61, 161 to 2398, 62, 164.

Potentially of note was I was working directly above the affected area a few days ago.

info about world save: 2 years old  aquatic update save that has riled forward with updates as published. File size is just under 200mb. The world is mostly solo survival although have had friends join the world from time to time (although not in the last 2 weeks). The world has never been swapped to creative. Seed: -1034984793

Happy to give more info, test for repeatability, and help if needed.

Best regards,

steve