[Bug] The tooltip arrow is not showing when the property "confine" is set to true

[jgoncab-arte]

Version

5.4.3

Link to Minimal Reproduction

https://echarts.apache.org/examples/en/editor.html?c=bar-simple&version=5.4.3&code=PYBwLglsB2AEC8sDeAoWsAeBBDEDOAXMmurGAJ4gCmRA5AMYCGYVA5sAE7m0A0J6AE2aMiAbVoBZGL1i0AKgFcqM2gHUqAlXIAWClQDEOEFQGVmphdFoBdEgF8-6MMGAAbSCCKpSsPNuAA7kRgHEqOpCDAeBCQMHTOILz8sPQwAGYQ0DRkoVT24eQ4-F7JFNR0AG6Mrkq0-SR4VEZUhLCiyd4-sEJgIm0AjABMAAw8sCOjsP0ArJMAHJMA7JP9_SsAzMPW4T5l2bQARowcdT52JLZ2ANxAA

Steps to Reproduce

1. Set tooltip.show to true.
2. Set tooltip.position to 'top', 'left', 'right' or 'bottom'.
3. Set tooltip.confine to true.

Current Behavior

When tooltip.confine is set to true the arrow of tooltip is no longer shown.

Expected Behavior

I was expecting the arrow to still display as it does when confine is set to false.

Environment

Modifying the examples provided in https://echarts.apache.org/ . For example: https://echarts.apache.org/examples/en/editor.html?c=bar-simple&version=5.4.3&code=PYBwLglsB2AEC8sDeAoWsAeBBDEDOAXMmurGAJ4gCmRA5AMYCGYVA5sAE7m0A0J6AE2aMiAbVoBZGL1i0AKgFcqM2gHUqAlXIAWClQDEOEFQGVmphdFoBdEgF8-6MMGAAbSCCKpSsPNuAA7kRgHEqOpCDAeBCQMHTOILz8sPQwAGYQ0DRkoVT24eQ4-F7JFNR0AG6Mrkq0-SR4VEZUhLCiyd4-sEJgIm0AjABMAAw8sCOjsP0ArJMAHJMA7JP9_SsAzMPW4T5l2bQARowcdT52JLZ2ANxAA

Any additional comments?

It also happens when I create a function for the property tooltip.position even when it returns 'top' and it would be nice that at least in this case the arrow would still show. I have a case when I use a function to decide if I want it on top or on the right so I can not use simply a string to set that property.