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When a smartphone maker introduces a new update for a device, that update is rolled out to a small number of phones at first. On the plus side, it eliminates the need for more users to use the update. As a result, new updates are brought to solve the problems for the rest. OnePlus followed the same pattern with their Nord phones.
A few days ago, Android 11 based OxygenOS 11 update was brought for this phone. This update was initially rolled out for a number of devices. However, this update is currently suspended due to issues with those devices.
A staff member at the OnePlus forum informed all OnePlus Nord users that they have suspended this update for the time being due to some bugs in the new update. However, the OxygenOS 11 update will be rolled out soon after resolving the issue. Although he did not mention any specific date.