I have a redstone clock with a dispenser that shoots items into the nether and everytime it shoots a block I experience serious Ticks Per Second lag, rubber banding (some blocks that I put before dissapear, chests do not open...) Since I have to run the clock for my Iron farm, this TPS lag is so annoying. Sometimes the lag is worse than this video I recorded. I think that this issue is related/the same that this reported in version 1.13: https://bugs.mojang.com/browse/MC-134649

I uploaded the video to youtube since the video size is 178MB and I can only upload 10MB here.

Video link: https://www.youtube.com/watch?v=EV9Kk9gngYI