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upstream fix:
https://github.com/ClusterLabs/pcs/commit/302b83046244d5d194cf8c33db57d9344476

After fix:
[root@rhel81-node1 ~]# rpm -q pcs
pcs-0.10.1-6.el8.x86_64

[root@rhel81-node1 ~]# pcs stonith sbd enable SBD_TIMEOUT_ACTION=off,flush
Running SBD pre-enabling checks...
rh81-1: SBD pre-enabling checks done
rh81-2: SBD pre-enabling checks done
Distributing SBD config...
rh81-1: SBD config saved
rh81-2: SBD config saved
Enabling SBD service...
rh81-1: sbd enabled
rh81-2: sbd enabled
Warning: Cluster restart is required in order to apply these changes.
[root@rhel81-node1 ~]# pcs stonith sbd config
SBD_DELAY_START=no
SBD_STARTMODE=always
SBD_TIMEOUT_ACTION=off,flush
SBD_WATCHDOG_TIMEOUT=5

Watchdogs:
  rh81-2: /dev/watchdog
  rh81-1: /dev/watchdog

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHEA-2019:3311