vue-tsc wrongly infers "undefined" with optional chaining

[TheDutchCoder]

Consider the following code and types:

const selectedCollection: Ref<Col1 | Col2 | null> = ref(null)
const selectedCollectionId = computed(() => selectedCollection.value?.id)
const selectedCollectionAccountId = computed(() => selectedCollection.value?.collaborators.find(col => col.id === '1'))  // throws "This expression is not callable."

For some reason, vue-tsc is not able to remove the undefined type when using the optional chaining. It still thinks that selectedColelction.value can be null, even though the optional chaining should take care of that.

As a reference, here's the same implementation in regular TypeScript: https://www.typescriptlang.org/play?#code/JYOwLgpgTgZghgYwgAgMIHsA2cBGBnARmQG8AoZZAfUrAE8AHCEOAWwgC5kAiDTbHdFDhhBXANzlkwACac8YKKADmEgL6lSoSLEQpeuPACYSk6nUbM2nHln6DhoiRRlyFytRq3R4SNFiJkFGYMTKwc3LyYEAhgwOgg4pIuyPKKICqSiAjoAK7gAJKyKW7pyAA+yCA5fE7I2eBCMYWuaUrlldWYtdl8uPYiUHic+vgEANoAuh6kEAAe9IJgUuDeun6YxoFUNCGW4TZ80bHxic5Fqe6ZCNl5YM3Fre1VNZL1Coh35yVtFc9dr7Y+kIBkN1gZDJNpvV5Mg4MN-MgALwmChBHYWMLWSJHOIJAA0kjOnAA5ARiQTUXVAQJgYJQZMKaisrkCkU-oyKG9Gp9OH9SOpSNCljh4RskSjUcEMVYIrYcScOVIiqTyYSqb0aQ5BpwGWrmbd7uy1VyPobOvyNELkDBxQAKHqiogVXjGX6dACUSIAfBLOfE8FgIAA6TDoJT2rAAfiDPTstMGQZgoGkEcw3vVQZkSMRyJV7vd-KAA

[TheDutchCoder]

This looks like a limitation in TS: microsoft/TypeScript#33591