I've just had my Java version updated to 1.15 Pre Release 1, I had intended to travel to an End Cities to look for Shulkers to build more Shulker boxes, however while I can get to the End without issue, the End Portal found in strongholds that send you to the End render and function properly, but the End Portals that appear along the perimeter of the main island after defeating the Ender Dragon are bugged. Whenever you get close to those End Portals the game crashes.
Also, side note, I know this is likely being worked on, but there are major rendering issues in the game when trying to render distance landscapes.
Environment
Minecraft: Java 1.15 Pre Release 1
Launcher: 2.1.9616
OS: Windows 10 Professional 1909 (10.0.18363.476)
RAM: 32GB DDR3 (4 x 8GB)
CPU: AMD FX-8350 Octo Core @ 4.2GHz
GPU: ZOTAC GTX 1060 Mini 6GB
Storage: 2 x Samsung EVO 850 256GB SSD (1 of which is OS boot drive)
2 x Western Digital 3TB 7,200rpm HDD
1 x Western Digital 1TB 7,200rpm HDD
Display: 2 x AOC 1,920 x 1,080 60Hz monitors (1 using HDMI, 1 using DisplayPort, both run from same GPU)
Thank you for your report!
We're actually already tracking this issue in MC-166004, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature in the future to see if the issue has already been reported.
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