Information on new regulation in regards to commuter allowance and Covid-19 exception can be found here.
Beginning of April it has been decided that in case of Covid-19 reasoned short time working, home office or quarantine, no reduction in regards to commuter allowance will be applied, i.e. employees can still receive their full commuter allowance (even though they might not commute). It has been now defined that this regulation is only valid up until end of 2020.