try adding this css
input, textarea {
-webkit-user-select: auto !important;
-khtml-user-select: auto !important;
-moz-user-select: auto !important;
-ms-user-select: auto !important;
-o-user-select: auto !important;
user-select: auto !important;
}
I suppose ionic includes some css to avoid the copy/paste as usually the apps don't allow you to copy their content
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