[GAMEPLAY] Unsealed Spellbook - Swapped spells unusable

So I play spellbook Pyke. I don't know if this is a Pyke/spellbook issue, as I don't really play spellbook on anything else. Twice now, mid-game, somewhere around the third or fourth spell swap, this bug occurs. The spell I have swapped my cleanse to, be it TP, smite, whatever, is grayed out and unusuable. The game gives me the same alert as when a summoner is on cooldown. When switching spells, there is that brief 5 second cooldown before the new summoner is usuable, which typically is displayed overtop the summoner spell icon. Both times this bug has occurred, the CD timer has not appeared, and the spell has remained grayed out as though there were still a CD clock overlayed on it. Switching spells again has no effect. The first time the bug occurred, three swaps into the bug I died to an enemy player. This finally reset my spells and I was able to use it. The second time it happened, I tried to execute to get past the bug. This had no effect. In the next teamfight, I died to an enemy champion and this also had no effect. The F slot summoner remained locked, regardless of swaps to new spells, through the end of the game.

In the first game, I tried swapping my D slot summoner to a new spell so I could at least utilize my keystone. This bugged out the second summoner as well, and I was summonerless until I died and it finally unbugged. The second time it happened, I did not attempt to switch my D slot summoner. I'd like the bug fixed, but not so badly I'm gonna forfeit my flash to test it. ;)

I do not know what specifically triggers this bug. I've only seen it twice, and several weeks apart. I have not been able to intentionally duplicate the effect.

Anyone know a workaround or if this is a known bug?