Power Automate Desktop操作Cogon日期控件无效问题求助

需要从老旧系统Cogon下载数千份文件，手动操作流程（打开系统、申请归档、设置单日日期范围后点击Ok下载）完全正常；但使用Power Automate Desktop自动化操作时，无论通过键盘命令、模拟按键、上下键还是JS代码设置日期字段值，视觉显示均正常，点击Ok后系统却无响应，仿佛未输入任何内容。用JS设置值后聚焦并按下Down键，日期会被重置，推测是未触发系统JS与后端交互的逻辑。

<div style="width:100%;height:100%;overflow:hidden;">
<table class="Common-CellPadding0 Common-CellSpacing0 DateTimePicker-Layout" dir="LTR">
<tbody><tr>
<td class="nobr Common-AlignCenter Common-VAlignMiddle">
<input 
id="VWG10845_1" type="text" data-vwgeditable="1" value="25"
class="Common-FontData DateTimePicker-InputValue_eq"
style=
"width:13px;display:block;margin:0px;padding:0px;
clear:both;position:static;text-align:center;text-shadow:inherit;"
onfocus="mobjApp.DateTimePicker_OnFocus('10845','1',this,window);"
data-vwgposition="1"
onkeydown="mobjApp.DateTimePicker_OnKeyDown('10845',this,window,event);"
onblur="mobjApp.DateTimePicker_OnTokenBlur('10845','1',this,window);"
onclick="mobjApp.DateTimePicker_OnClick(window,this,'10845','1');"
onmouseup="mobjApp.DateTimePicker_OnMouseup(event);"
tabindex="-1" data-vwgfocuselement="1">
</td></tr></tbody>
</table></div>

• 发送数字作为键盘命令
• 发送数字作为模拟键盘按键
• 仅发送上下键命令
• 使用JS代码设置字段值（代码如下）：

function ExecuteScript()
{
document.querySelectorAll('input[id ^=VWG][id $=_1][class="Common-FontData DateTimePicker-InputValue_eq"]')[0].value=%Tag%;
document.querySelectorAll('input[id ^=VWG][id $=_3][class="Common-FontData DateTimePicker-InputValue_eq"]')[0].value=%Monat%;
document.querySelectorAll('input[id ^=VWG][id $=_5][class="Common-FontData DateTimePicker-InputValue_eq"]')[0].value=%Jahr%;
document.querySelectorAll('input[id ^=VWG][id $=_1][class="Common-FontData DateTimePicker-InputValue_eq"]')[1].value=%Tag%;
document.querySelectorAll('input[id ^=VWG][id $=_3][class="Common-FontData DateTimePicker-InputValue_eq"]')[1].value=%Monat%;
document.querySelectorAll('input[id ^=VWG][id $=_5][class="Common-FontData DateTimePicker-InputValue_eq"]')[1].value=%Jahr%;
}

内容的提问来源于stack exchange，提问作者Maxim Moloshenko