[CLIENT] Black screen in champion select forced me to restart client, losing one of my promo games

So I opened up league today, the patch being 7.4 and I am on the new client. I queued up for a solo ranked game. After a wait of around a minute to two minutes the queue pops up and I accept but someone had declined. At this point I go to the loot tab of the client. Then as I am waiting, maybe a couple seconds after the first queue, I get another queue. This time after the queue ends my screen goes black, absolutely nothing I can do. This has happened a couple times before, so I thought it was just loading. Keep in mind, based on previous experiences, I thought someone had declined the queue and it was taking me back to the home screen. I wait for a while (usually it takes less than 10 seconds to load). I realized something was wrong and I couldn't do anything. I'm forced to restart the client causing me to "dodge" in champion select (I didn't know I was in champion select I thought someone declined queue and I was back in home but it wasn't loading). I was in promos (Silver 3 100LP with one win already). I hadn't realized that leaving the queue made me lose a match until I queued up for another match and had a timer, at this point everything clicked and I checked my ranked tab of the profile section to see if I had indeed lost my ranked game... and I did.

Steps to Recreate (I tried to recreate it in a normal draft game so i wouldn't lose another promotion match):

1. Queue up for a draft type match.

2. Go into the loot tab

3. Wait for queue to pop up and accept

From my recreation in a normal draft game I had gotten a black screen, but it wasn't nearly as long as the one I had before and it ended up loading in around 10 seconds.

If possible I would like the extra game in my promotions that I lost because of this bug. I realize it was partly my fault for "dodging" the match but there was nothing I could have done, and because my screen was black I would have ended up dodging once my ban timer completed. I wasn't aware I was in champion select, partly because I play with no sound (so no sound for the champion select stuff) and partly because I was talking to someone in discord and league social area. I will refrain from playing a ranked match until an answer is given in whether I can get a match back in my promotion series. (In the mean time I will play ARURF:D.)

P.S.: I have no pictures or videos of the original event because it didn't occur to me that it would turn out this way. P.P.S: I have noticed that the screen turns black when accepting a queue in most matches, but it was abnormally long in the situation I described in the first paragraph.

Thank you for reading and have a good day.