CSS subgrid buggy in Chrome?

Question

I have a css grid with subgrid. If i limit the subgrids height height of the original grid doesn't shrink. This is only in Chrome. Firefox and Safari work as expected.

Here is a Codepen of my minimal reproducing code. Have I done something wrong or is it really a Bug in Chrome?!

.wrapper {
  display: grid;
  grid-template-columns: auto auto;
  background: blue;
  overflow: scroll;
  max-width: 10rem;
  border: 2px solid red;
}

.wrapper span {
  border: 1px solid white;
  color: white;
  text-align: center;
  padding: 0.3em 1em;
}

.sub {
  display: grid;
  grid-template-columns: subgrid;
  grid-column: 1 / -1;
  max-height: 3rem;
  overflow: scroll;
  background: gray;
}

<div class=outer>
  <div class=wrapper>
    <span>Foo</span>
    <span>Bar</span>
    <span>Foo</span>
    <span>Bar</span>
    <div class=sub>
      <span>Sub1</span>
      <span>Sub2</span>
      <span>Foo</span>
      <span>Bar</span>
      <span>Foo</span>
      <span>Bar</span>
    </div>
  </div>
</div>

Answer 1

If it works in the others but fails in chrome with no code changes, I'd imagine it is a bug. If you can't track down a solution to using grid, I'd suggest using flex instead - the example below shows how to adjust the implementation to flex instead.

Also, any users on windows-based browsers will see horrible scrollbars in your code example, making that interface completely unusable. You will want to test your output in that scenario - using overflow: auto instead of overflow: scroll will also prevent it from rendering unnecessary scrollbars (auto will only introduce a scrollbar when the content overflows, while scroll always shows both horizontal and vertical scrollbars)

.wrapper {
  display: flex;
  flex-wrap: wrap;
  background: blue;
  overflow: scroll;
  max-width: 10rem;
  border: 2px solid red;
}

.wrapper span {
  display: block;
  box-sizing: border-box;
  border: 1px solid white;
  color: white;
  text-align: center;
  padding: 0.3em 1em;
  width: 50%;
}

.sub {
  display: flex;
  flex-wrap: wrap;
  max-height: 3rem;
  overflow: auto;
  background: gray;
}

<div class=outer>
  <div class=wrapper>
    <span>Foo</span>
    <span>Bar</span>
    <span>Foo</span>
    <span>Bar</span>
    <div class=sub>
      <span>Sub1</span>
      <span>Sub2</span>
      <span>Foo</span>
      <span>Bar</span>
      <span>Foo</span>
      <span>Bar</span>
    </div>
  </div>
</div>

Answer 2

I just got a new Chrome Version and seems like the bug has been fixed. Somewhere between 121.0.6167.184 and 122.0.6261.57.