Looks like calendar/libical/zoneinfo/America/Sao_Paulo.ics is wrong about when summer time starts which creates the issue. There is also a tzdata error fixed the new package available from Debian
Looks like calendar/ libical/ zoneinfo/ America/ Sao_Paulo. ics is wrong about when summer time starts which creates the issue. There is also a tzdata error fixed the new package available from Debian