It does actually look like cold damage to me. It can take a while to show up after the cold event. My Zebra Stripes was looking very good then a week & a half ago we had a very cold night. It does not look great now. It usually shows worse damage after it gets warm again. Your ERC looks like a different issue though.

It pains me to admit that it was me. I am the Hosta torturer (torcher). I got a new toy last year to torch the weeds and early this spring, the weeds were quickly getting a jump start as the Hosta begin spiking. I moved the torch through the beds frying the little buggers moving quickly past any Hosta beginning to poke through the ground. Well, not fast enough. A blast of heat quickly ruptured the cell walls on the first plant, Well Shaked, as an entire plant picture would show all the outer most leaves around the whole plant showing the same transparent patch. Ironically, most of the damage occurred on leaves that were stabilizing and the plant now looks extremely well streaked. Guess its better than the driveway treatment to make this plant behave. pic to follow.

The HVX scare was just the heat hitting the plant veins on the outside of the spike and soaking up some water from the rain. Here it is later. It may have scared this leaf into streaking.

ERC had a lot of shallow roots spread wide that were harmed and the plant regressed significantly. Luckily, I have another healthy plant. I'm thinking about dividing and potting this plant until it recovers. I couldn't really see any root damage, but it should be easier to spot now.

Cold Damage/Heat damage probably does real similar things to the plant tissue, and it did take a while to show up.

Live and learn I suppose.

Steve I really like my weed torch (Weed Dragon) but I am not going to use it in my beds now! Not the kind of damage we see everyday but yes heat/cold damage look similar. Sorry this happened.

I have the same issue on my American Sweetheart this year.

Has it been a very cold and wet spring for you?

No frost since April 10th (very early last frost date for us). The heat damage showed up most prominently when we got cool (50ish) and wet weather. Yours is most likely cold damage (not too many of us are having blasting heat). American Sweetheart and most of my other Hostas survived the torching unscathed.

How did you figure out what happened?

Thanks Ken, I couldn't quite figure out how to put it. The damage showed up so much later, I didn't recall doing it until I was trying to puzzle out what happened days later. Even then, I didn't realize that the same thing could have happened to English Sunrise. As Promised here is Well Shaked now. You can still see some of the damaged not-so-streaky leaves.

literally laughed out loud ....