LEWG approved two polls regarding the direction of D2372R0 at its 2021-05-03 telecon. Minutes here.
As reflected in the minutes, there was a request for SG16 to affirm LEWG's direction since prior SG16 polls of LWG3547 did not indicate consensus for that direction as indicated in the minutes from the SG16 telecon held 2021-04-28.
SG16 conducted the following poll at our 2021-05-12 telecon (minutes not yet available) and does indeed affirm LEWG's direction.
Poll: Forward D2372R1 to LEWG for inclusion in C++23 and with the intent that it be applied retroactively to C++20.
Consensus: Strong consensus in favour.
Author's position: SF
Note that D2372R1 contains the LEWG requested changes to preserve locale dependent formatting for ostream formatters.
My perception is that SG16's change in consensus is attributable to two factors: