Happens exactly when you get certain tech as a loot and you currently researching it.
To reproduce just raid the planet with 1st Raider fleet and if you get the same tech as a reward you get the bug.
https://mega.nz/file/mzZVSKYI#-Coljt_RI ... vL35Zq_H1Y

Bug is still present - 1.2.0.5 Public Beta

It is somewhat connected with raiding.
Sending one save before and one save after:
https://mega.nz/file/SioG0JLQ#YXLtfQ5yw ... xmhQHWB7_I

Got this bug again. I think it is related to loot from raiding independent colonies.

Suddently got over -550% research on basic tech (troop transport)
Gizurean - slowest research. Only one music mod.
Save:
https://mega.nz/file/KiZTCBhb#PU5fDUJ74 ... lbhaekuaDA