Same problem. Just put this into a html and open in a Edge Chromium 91,92 or 93... 15 items works fine. 16+ items and dropdown will not open. Major break or issue.
<label for="ice-cream-choice">Choose a flavor:</label>
<input list="ice-cream-flavors" id="ice-cream-choice" name="ice-cream-choice" />
<datalist id="ice-cream-flavors">
<option value="Chocolate">
<option value="Coconut">
<option value="Mint">
<option value="Strawberry">
<option value="Vanilla">
<option value="Chocolate">
<option value="Coconut">
<option value="Mint">
<option value="Strawberry">
<option value="Vanilla">
<option value="Chocolate">
<option value="Coconut">
<option value="Mint">
<option value="Strawberry">
</datalist>
