I forgot to increase the level cap after adding new tech nodes to the tree! The new (soft) level cap is 76. Sorry Commanders!
RefinedBear
Full Changelist
Bugs
Fixed (increased) level cap to 76 to make sure all Tech nodes are obtainable
v0.18.14 Patchnotes - Hotfix Level Limit
Source: Steam Community (opens in a new tab)
Build and release context
Steam update times within 24 hours of this post. Matching dates do not confirm which build it describes.
Build 24605679 · public branch
Steam updated · First observed