First post I've ever made, but I can't seem to find anyone with this problem.
I've ran all 19 paths in the Corridors of Time and only have 18 lore entries. I've also ran the.emblem path and have the emblem. I noticed it messed up around pathway 12/13 and yes I have ran them all a second time.
What I believe happened was before the lore popped up on my screen I walked/hopped towards the tomb and was teleported to the beginning. The lore never popped up and now it seems it never will.
With a triumph score of 107,360... you can tell I've been meticulous about these "trivial" things, but I cannot for the life of me figure out why it won't pop up.
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You'll be able to reach the Timelost Vault using a valid code, but the Lore entries are discovered in order no matter what codes are used, and a code can only be used once (whether going backwards or forwards) to unlock a new Lore entry. This chart is the best resource I've found with all known codes: https://twitter.com/berserkbrandee/status/1217447509640929280