I'm using the with SDK version 13.1.0 along with S140 SoftDevice v 5.0.0-3.alpha and trying to utilize the Bluetooth 5 Extended Advertising feature.
The function ble_advdata_set() limits the data size to BLE_GAP_ADV_SR_MAX_LEN_DEFAULT which is equal to 31. I tried changing it to use the newly defined macro BLE_GAP_ADV_SR_MAX_DATA_LEN (which is set to 1650 bytes), but that didn't work and the application doesn't advertise anymore.
Unfortunately, this is not possible yet.
If it was, it should have been mentioned in the release notes.