After the indexer will be unregistered from the network and receive INACTIVE status on My profile -> Delegating page, there is no way to undelegate tokens from this indexer. Explorer shows the following tooltip: This indexer cannot be undelegated from until they collect all the early era's rewards. Please contact the indexer to resolve the issue

First, I saw this problem with the another indexer 0xAF2c0A4495E66FB1f27F553Dc8376bBc4560f839 after it was unregistered from the network. Then I tried it with my own indexer 0x848488C3daa5d31E43E8d02af6EaE61f8Fe41d6d and received the same bug. Initially Undelegate button was available in the era when the Unregister action was proceeded successfully, without any errors. But after the current era finished, the button became unavailable with the error tooltip.

Attached few screenshots with my delegation to another indexer and with the delegation to my indexer from a different address. Both cases happened after indexers were unregistered from the network.
Снимок экрана 2022年05月22日 в 11 25 13
Снимок экрана 2022年05月22日 в 21 18 34

Before I have unregistered my indexer, I checked the logs to see that collected and distributed rewards have SUCCEED status in the current era

QuantNode team