Will take a look

Hi @Sushant_savla, thanks for taking the time to report this! Going to https://gu.wikisource.org/w/index.php?title=પૃષ્ઠ:Baiju_Bahavaro.pdf/૮&action=edit&redlink=1&debug=true I can see the image for a short moment, and then the image is gone again.

The moment that the image is shown, its URL is
https://upload.wikimedia.org/wikipedia/commons/thumb/0/05/Baiju_Bahavaro.pdf/page8-1024px-Baiju_Bahavaro.pdf.jpg. That is correct.

However, the reasons I don't know, a bit later the page on gu.wikisource.org tries to load
https://upload.wikimedia.org/wikipedia/commons/thumb/0/5/Baiju_Bahavaro.pdf/page8-1024px-Baiju_Bahavaro.pdf.jpg which is a 404 error.

Note the path difference: 5 vs 05.

I don't know why (which exact code) is loading the image twice, so the tags I am adding here might be wrong.

On an unrelated note (not related to this bug!): If you follow https://www.mediawiki.org/wiki/Help:Locating_broken_scripts (which is always a good idea) you can see Error: Unknown module: ext.wikiEditor.toolbar. On https://gu.wikisource.org/wiki/મીડિયાવિકિ:Gadgets-definition , the line button-center[ResourceLoader|dependencies=ext.wikiEditor.toolbar|default]|button-center.js is broken and needs fixing by the community.

It appears that the function at the bottom of https://gu.wikisource.org/wiki/MediaWiki:Common.js is causing this problem:

// Script to fix the fraction of PDFHandler
// Copy this code in your User:Username/common.js
$( function(){
	if( mw.config.get('wgCanonicalNamespace') === 'Page' ){
		var file_url = $('.prp-page-image > img').attr("src"),
			rx = /[-+]?([0-9]*\.[0-9]+|[0-9]+)/g;
		
		matches = file_url.match(rx);
		matches.forEach(function(v ,k ){ 
			file_url = file_url.replace(v, Math.trunc(v)); 
		});
		
		$('.prp-page-image > img').attr("src", file_url);
	}
});

This script, called on page load, replaces every number in a thumbnail URL with that number truncated to an integer, which strips leading zeros. It was placed in MediaWiki:Common.js by Sushant salva in this edit. I'm not sure what problem it's trying to solve, so I can't really recommend a fix short of completely removing it.

In T261420#6416738, @AntiCompositeNumber wrote:

This script, called on page load, replaces every number in a thumbnail URL with that number truncated to an integer, which strips leading zeros. It was placed in MediaWiki:Common.js by Sushant salva in this edit. I'm not sure what problem it's trying to solve, so I can't really recommend a fix short of completely removing it.

I believe the snippet was an attempt at addressing T242316.

Looks like it. That's been fixed in code, so removing the snippet is the right solution.

In T261420#6416665, @Aklapper wrote:

On an unrelated note (not related to this bug!): If you follow https://www.mediawiki.org/wiki/Help:Locating_broken_scripts (which is always a good idea) you can see Error: Unknown module: ext.wikiEditor.toolbar. On https://gu.wikisource.org/wiki/મીડિયાવિકિ:Gadgets-definition , the line button-center[ResourceLoader|dependencies=ext.wikiEditor.toolbar|default]|button-center.js is broken and needs fixing by the community.

button-center[ResourceLoader|dependencies=ext.wikiEditor.toolbar|default]|button-center.js needs to be changed to button-center[ResourceLoader|dependencies=ext.wikiEditor|default]|button-center.js for it to work correctly.

Thank you @Soda I have corected the same.
Thank you @Aklapper I will do the needful
Thank you @AntiCompositeNumber
Thank you @Mahir256
Thank you all.