insert_table_in_mail problems since 5.8

Till <Version 5.8 i use a script template from the tutorial to generate a table drom Date input(s)….Holyday planning from….See https://www.maler-jost.de/urlaub
With Version >5.8x there are strange line breaks.

I hope somebody can help me….

Function from tutorials in functions.php

function insert_table_in_mail($html, $field, $data, $cf7_key){
  if( $cf7_key == 'urlaubsantragv2' || $cf7_key == 'urlaubsantrag' )
  		{ //always validate the form being submitted.
	 
  
    /*return $html;*/
   /* } */
  $build = true;
  switch($field){ //if either of fields present in the table...
    case 'beginn':
      $label = 'Urlaub vom';
      $html ='<ul style="list-style-type:none;border-right:1px solid black;display:inline-block;float:left;padding:5px">';
      break;
	case 'beginn-delete':
      $label = 'Urlaub vom';
      $html ='<ul style="list-style-type:none;border-right:1px solid black;display:inline-block;float:left;padding:5px">';
      break;
    case 'ende':
      $label = 'Urlaub bis';
      /*styling for last column*/
      $html ='<ul style="list-style-type:none;display:inline-block;clear:right;padding:5px">';
      break;
	case 'ende-delete':
      $label = 'Urlaub bis';
      /*styling for last column*/
      $html ='<ul style="list-style-type:none;display:inline-block;clear:right;padding:5px">';
      break;
    default: //else this isn't a field we want in the table.
      $build=false;
      break;
  }
  if($build){
	  
    $html .='<li style="background-color:lightgray;margin:0;padding:3px 5px">'.$label.'</li>';
   	  foreach($data as $key=>$value){
	
		 if (!empty($value)) 
		 {
  			$timestamp = strtotime($value);
 				if ($timestamp === FALSE) 
				{
   					 $timestamp = strtotime(str_replace('/', '-', $date));
			  	}
 		$value = date('d.m.Y', $timestamp);
		}
		  else
		  {
			$value = "---";
		  }
		$html .='<li style="margin:0px;padding:3px 5px">'.$value.'</li>';
		}
		$html .='</ul>';
	}
  }
  return $html;
}