I'm getting these weird issues with chunks not rendering properly on Optifine 1.14.4 and Vanilla on my Chromebook. Its as if the block making up the chunks are invisible. I was able to replicate the problem on Vanilla 1.14.4. Everything else works properly, however. The version is NOT 1.15.2.
1.14.4 is outdated and, in your case, modded, so there is no point in reportnig this.
but maybe try turning off/on VBO