Changing max DR in service profile has no effect on registered devices

[J-Paul0815]

What happened?

When trying to create a downlink of 70 characters I got the following error:
"error":"payload exceeds max payload size"
Well described here too:
https://github.com/brocaar/chirpstack-network-server/issues/391
The (subsequent) change from "Maximum allowed data-rate" to 5 was not a solution.

What did you expect?

Changing max DR in the service profile should also have an effect on registered devices
(SF7)

To solve my problem, I had to delete the device and register it again with a newly created service profile with DR5

Steps to reproduce this issue

Steps:

1. Create a service-profile with max DR 0
2. register a device with this service profile
3. Try a downlink longer than 51 characters
4. (you get the "payload exceeds max payload size" error)
5. change the max DR in service-Profil to 5
6. Try a downlink longer than 51 characters
7. (you get the "payload exceeds max payload size" error)

Your Environment

Component	Version
Application Server	3.17.8
Network Server	3.16.5
Gateway Bridge	3.14.5

[J-Paul0815]

Test Chirpstack V4 with Device DR5 SF7 Region EU868 (Min DR: 0, max DR: 5)
level:"ERROR"
code:"DOWNLINK_PAYLOAD_SIZE"
description:"Device queue-item discarded because it exceeds the max. payload size"
max_payload_size:"51"
item_size:"71"
Is there somewhere else to specify the max DR (like in the service profile in V3)?