Laravel - ToDateString() Behaves abnormally on Live Server - php

Question

In my Laravel-5.8, I have this code:
Controller
public function index()
{
$userCompany = Auth::user()->company_id;
$leaverequests = HrLeaveRequest::where('company_id', $userCompany)
->orderBy('created_at', 'desc')
->get();
$incompleteCount = $leaverequests->filter(function ($item) {
return (
$item->leave_status == 2 ||
$item->leave_status == 3 ||
$item->leave_status == 4
);
})
->count();
$currentstatus = HrLeaveRequest::select('leave_status')
->where('is_resumption_activated', 1)
->whereIn('leave_status', array(3, 4))
->where('resumption_date', '<=', Carbon::now()->toDateString())
->orderBy('created_at', 'DESC')
->first();
return view('leave.employee_leave_requests.index')
->with([
'leaverequests' => $leaverequests,
'incompleteCount' => $incompleteCount
])
->with('currentstatus', $currentstatus);
}
Model:
protected $dates = [
'resumption_date',
];
View
<div class="panel-heading clearfix">
<div class="container-fluid">
#can('leave_request_create')
#if (! $leaverequests->count() || $currentstatus)
<div style="margin-bottom: 10px;" class="row">
<div class="col-lg-12">
<a class="btn btn-info" href="{{ route("leave.employee_leave_requests.create") }}">
Add Leave Request
</a>
</div>
</div>
#elseif (! $currentstatus)
<div style="margin-bottom: 10px;" class="row">
</div>
#endif
#endcan
</div>
</div>
The Purpose is to make the "Add Leave Request" when the condition is fulfilled. I tested it on my Windows Local System, and it works fine.
But when I deployed to Linux Ubuntu server, the "Add Leave Request" remains hidden even when the condition is fulfilled.
But when I removed this code:
where('resumption_date', '<=', Carbon::now()->toDateString())
from the Linux server, it becomes visible (it works).
PHP Version for both local sytem and Ubuntu server is PHP-7.3.
How do I get this resolved.