Mongol Shia Bow Limbs Improved upgrade does not work

Hi! Reporting another mongol bug here.

The Improved Shia Bows upgrade seems to be completely bugged for mongols.

When researching it, one uses up the cost of the research + the stone. However when it finished researching, it only researches the Shia Bow upgrade. And leaves the Improved Shia Bow upgrade is just greyed out.
Same thing happens if you research just regular Shia Bow upgrade, you become unable to research Improved Shia Bow upgrade.

Mangudai range stats without upgrade:

Mangudai range stats with all upgrades:

Shia Bow Limbs Improved bugs out after researching it:

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Thank you @Kameho3743! The team is aware and investigating. Appreciate the report!