The bidi.css file has an RTL position rule for the caret but it doesn't match the standard LTR rule.
File:
bidi.css
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Find:
.rtl .caret {
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border-right: 1px solid;
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border-right-color: inherit;
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border-left: none;
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right: 6px;
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}
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Change To:
.rtl .caret {
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border-right: 1px solid;
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border-right-color: inherit;
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border-left: none;
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left: -6px;
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right: auto;
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}
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