I file here two bugs because they are closely connected. The whole process of handling the data should be revised. Involved methods are at least (others may be):
```
get()
save()
exists()
has_content()
```
`delete()` seems to work well.
**Steps to replicate the issue**:
```
>>> page = pywikibot.Page(site, 'Teszt') # It does not exist at his point
>>> # Now I create [[Teszt]]
...
>>> page.get()
'Teszt'
>>> page.text
'Teszt'
>>> # Now I delete [[Teszt]]
...
>>> page.get()
'Teszt'
>>> page.text
'Teszt'
>>> page.exists()
True
>>> page.get(force=True)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "c:\Pywikibot\pywikibot\page\_page.py", line 397, in get
self._getInternals()
File "c:\Pywikibot\pywikibot\page\_page.py", line 436, in _getInternals
self.site.loadrevisions(self, content=True)
File "c:\Pywikibot\pywikibot\site\_generators.py", line 772, in loadrevisions
raise NoPageError(page)
pywikibot.exceptions.NoPageError: Page [[hu:Teszt]] doesn't exist.
>>> page.exists()
True
>>>
```
**What happens?**:
After `page.get(force=True)` the page data were not refreshed suffuciently. `page.exists()` believes the page is still existing.
**What should have happened instead?**:
`page.get(force=True)` should refresh `self.pageid` so that `page.exists()` will not be mislead.
I don't know what further measures are neccessary for other methods.
Documentation of `page.exists()` should clearly describe what happens and how to force rechecking.
**Steps to replicate the issue**:
```
page = pywikibot.Page(site, 'Teszt')
print('Exists:', page.exists())
print('Id:', page.pageid)
page.text = 'Teszt'
page.save('Botteszt')
print('Exists:', page.exists())
print('Id:', page.pageid)
```
**What happens?**:
```
Exists: False
Id: 0
Page [[Teszt]] saved
Exists: False
Id: 0
```
**What should have happened instead?**:
Page.revid should have updated upon save()
**Software version** (skip for WMF-hosted wikis like Wikipedia): 8.0.0