I could reproduce your issue. So I think even re-installing would be of no help.
However, I found a setting which worked for me, i.e. stores individual TV-values:
As a widget I used "String formatter", not "Delimited List" (with "sentence case" as the sub-setting).
And left the rest as you have it.
The drawback is, that the default value does not work any more.
I was always a bit suspicious of those "widget" stuff and rarely used it.

And the inheritance of TV-values also has some problems, and maybe this also affects this default-value stuff.
I hope that one from the dev-team drops in and gives you more competent help.
I just thought that storing the TV-values is the most important aspect, not the default value.