0.17.4 save non-infinite mining productivity 15/15 level (30%) :?: sucesfully :?: converted to 2/3 (20%) in 0.17.6. I tried again, the result: save 0.17.4 mining productivity 30% 15 lvl (last non-infinite) done in technology tree, next infinity levels loaded in 0.17.5 mining productivity 70% 7 lvl ...

0.17.4 save non-infinite mining productivity 15/15 level (30%) sucesfully converted to 2/3 (20%) in 0.17.6.