TYPO3 News IMG_RESOURCE gives error on first call for sys_category images selected with overwriteDemand

I have a page with a news plugin that gives only news of a chosen category, in the sidebar of that page I use the image that is loaded for the category, i do that this way:

# cat detail page Images
lib.catImg = FILES
lib.catImg {
  references {
    table = sys_category
    uid.data = GP:tx_news_pi1|overwriteDemand|categories
    fieldName = images
    treatIdAsReference = 1
  }
  begin = 0
  maxItems = 5
  renderObj = IMG_RESOURCE
  renderObj {
    file.import.data = file:current:uid
    file.treatIdAsReference = 1
    altText.data = file:current:title
    stdWrap.typolink.parameter.data = file:current:link
    file.maxW=1920
    file.params=-rotate 0 -strip -quality 75
  }
}

in the fluidtemplate I call it as follows:

<section class="sidebar" style="background-image: url({f:cObject(typoscriptObjectPath: 'lib.catImg')})">

if I follow the link the page doesn't load the image (in debug mode it gives an error: No Content Object definition found at TypoScript object path "lib.catImg")

but if I do a ctrl + F5 the page loads correctly ... anyone recognises what is going on (and how to correct it)

TYPO3 V12.4.24 - News 12.1.0 (I load the same way from table 'pages' the field 'media' without trouble.)

ADDED: I did not change the code in my question after I got the right indications, otherwise the question makes no sense anymore, apply what is suggested in the accepted answer to make this work

Maybe the ordering of the typoscript including is wrong? Maybe news is included before the lib.catImg? If so the cache building reach the news displaying before the lib.catImg is included so the lib.catImg is not found?

I also think the typoscript is wrong. Instead of file:current:uid I would use file:current:publicUrl (also remove treatIdAsReference). I would remove stdWrap.typolink because you wouldn't want a link around your image url. Also altText is not needed because you don't have an image tag. Also use maxItems = 1 because you don't want more than one here.