Background image not covering td in Outlook 2018 - html

Question

I have background images in my email which I've configured using bulletproof backgrounds. In Litmus, the previews look exactly how I want it to be for Outlook.
However, for the latest version of Office 365 (Version 1808 - Build 10730.20102), the background image doesn't cover the td's entire width?
Preview:
The dark blue-ish color is the fallback color, but for that specific Outlook version, the background image is not covering the entire td.
Unsure why this is?
Code:
<table>
<tbody>
<tr>
<!-- Condition to allow background images to work in Outlook -->
<td style=" background-repeat: no-repeat;background-size: cover; max-height: 384px; min-width:600px;" background="https://storage.pardot.com/213851/80721/email_insert_1.png" bgcolor="#1f3c5a" height="384px" width="600" valign="top">
<!--[if gte mso 9]>
<v:rect xmlns:v="urn:schemas-microsoft-com:vml" fill="true" stroke="false" style="width:600px; height: 384px;">
<v:fill type="tile" src="https://storage.pardot.com/213851/80721/email_insert_1.png" color="#1f3c5a" />
<v:textbox inset="0,0,0,0">
<![endif]-->
<div style="min-height:300px;">
<table border="0" cellpadding="0" cellspacing="0">
<tbody>
<!-- Creating padding above nested div -->
<tr>
<td height="30" style="height:30px;">
<!--PADDING-->
</td>
</tr>
</tbody>
</table>
</div>
<!--[if gte mso 9]>
</v:textbox>
</v:rect>
<![endif]-->
</td>
</tr>
</tbody>
</table>

Answer 1

Please check again some changed.
<table bgcolor="#1f3c5a" style="vertical-align: top; background-position: top center; background-repeat: no-repeat;background-size: cover; -webkit-background-size: cover; max-height: 384px; width:600px;" background="https://storage.pardot.com/213851/80721/email_insert_1.png" border="0" cellpadding="0" cellspacing="0" width="600">
<tbody>
<tr>
<!-- Condition to allow background images to work in Outlook -->
<td height="384px" width="600" valign="top">
<!--[if gte mso 9]>
<v:rect xmlns:v="urn:schemas-microsoft-com:vml" fill="true" stroke="false" style="width:600px; height: 384px;">
<v:fill type="tile" src="https://storage.pardot.com/213851/80721/email_insert_1.png" color="#1f3c5a" />
<v:textbox inset="0,0,0,0">
<![endif]-->
<div style="min-height:300px;">
<table border="0" cellpadding="0" cellspacing="0">
<tbody>
<!-- Creating padding above nested div -->
<tr>
<td height="30" style="height:30px;">
<!--PADDING-->
</td>
</tr>
</tbody>
</table>
</div>
<!--[if gte mso 9]>
</v:textbox>
</v:rect>
<![endif]-->
</td>
</tr>
</tbody>
</table>

Answer 2

<table>
<tbody>
<tr>
<!-- Condition to allow background images to work in Outlook -->
<td style=" background-repeat: no-repeat;background-size: cover; max-height: 384px; min-width:600px;" background="https://storage.pardot.com/213851/80721/email_insert_1.png" bgcolor="#1f3c5a" height="384px" width="1000" valign="top">
<!--[if gte mso 9]>
<v:rect xmlns:v="urn:schemas-microsoft-com:vml" fill="true" stroke="false" style="width:600px; height: 384px;">
<v:fill type="tile" src="https://storage.pardot.com/213851/80721/email_insert_1.png" color="#1f3c5a" />
<v:textbox inset="0,0,0,0">
<![endif]-->
<div style="min-height:300px;">
<table border="0" cellpadding="0" cellspacing="0">
<tbody>
<!-- Creating padding above nested div -->
<tr>
<td height="30" style="height:30px;">
<!--PADDING-->
</td>
</tr>
</tbody>
</table>
</div>
<!--[if gte mso 9]>
</v:textbox>
</v:rect>
<![endif]-->
</td>
</tr>
</tbody>
</table>
Run code snipp