how to stop tinymce to replace path starting with /public/assets... with ../../../../public/assets...? - laravel-8

Question

I am using alexusmai laravel file manager together with tinyMCE. When LFM returns the path of a selected file in the insert/edit image window it is correct. It must include the public folder as I am on shared hosting /public/assets....
As soon as the insert/edit image window is closed, the url inserted in tinyMCE displays the logo/image correctly. When I look in the code editor the url is converted to ../../../../public/assets....
Even if I edited the path in the code editor and save, tinyMCE changes it back as soon as I return to the wysiwyg editor. In a way it's ok as it works but I would prefer that the path is kept as given by the user or LFM.
Is there anyway to stop tinyMCE to do that?
Here is the js code I use to initialise the editor:
window.onload = function () {
tinymce.init({
selector: '#{{ $field->name }}',
height: 600,
plugins: [
'image paste importcss searchreplace autolink preview',
'code visualblocks visualchars fullscreen image link media template',
'table charmap hr insertdatetime lists wordcount textpattern charmap quickbars emoticons help',
],
menubar: 'file edit view insert format tools table help',
toolbar: [
'code fullscreen preview | bold italic underline | image media template link | formatselect fontsizeselect | alignleft aligncenter alignright alignjustify | outdent indent | numlist bullist | forecolor backcolor | charmap emoticons | removeformat undo redo'
],
templates: [
{ title: 'Row Ani Img L', description: 'Row with animnated image on left', content: rowL },
{ title: 'Row Ani Img R', description: 'Row with animnated image on right', content: rowR }
],
content_css: '{{ makeURLabsolute(config('path')['public'].'custom/'.config('site.array_names')['file'].'.css',config('is_web')) }}',
branding: false,
toolbar_sticky: true,
toolbar_mode: 'sliding',
file_picker_callback (callback, value, meta) {
let x = window.innerWidth || document.documentElement.clientWidth || document.getElementsByTagName('body')[0].clientWidth
let y = window.innerHeight|| document.documentElement.clientHeight|| document.getElementsByTagName('body')[0].clientHeight
tinymce.activeEditor.windowManager.openUrl({
url : '/file-manager/tinymce5',
title : 'Asset Manager',
width : x * 0.8,
height : y * 0.8,
onMessage: (api, message) => {
callback(message.content, { text: message.text })
}
})
}
});
};